DON'T GET A THROTTLE BODY SPACER! It is my biggest regret with my car. I got the Helix Power Tower spacer on clearance for $40 and I still regret it. The worst thing about it is that it makes the most annoying sound when it gets 10-25% throttle. It whistles constantly on the freeway while I cruise and it sounds similar to an old VW bug's exhaust. It isn't bad when racing through the gears becuase it sounds kind of like a turbo but daily driving sucks. I am taking it off once I get a new gasket.

PS: I will sell you my spacer for $30 if you still want one.